It depends on the gun. It could be anywhere from 2 dollars (For the Secret Strike) to 50 (for the Stampede). Generally, the bigger and faster the gun, the more expensive.
it does not hurt but you take SOME TAPE [ANY KIND] AND CUT A LITTLE piece OFF ABOUT HALF OR THREE QUARTER INCH WILL DO AND YOU TAKE THE tape and you put it over the little hole on the side of the...